EP2179664A1

EP2179664A1 - Apparatus for the treatment of a vegetable product

Info

Publication number: EP2179664A1
Application number: EP08425685A
Authority: EP
Inventors: Remo Crosato
Original assignee: Lasi Srl
Current assignee: NoForm Srl
Priority date: 2008-10-22
Filing date: 2008-10-22
Publication date: 2010-04-28
Anticipated expiration: 2028-10-22
Also published as: EP2179664B1

Abstract

It is described an apparatus (10, 30) for the treatment of a vegetable product in the form of crushed material or liquid, preferentially must, comprising a tank (14, 34) to contain the vegetable product; scraping means (56) for scraping the dregs depositing on the bottom (18, 28) of the tank; one or more nozzles (42) connected to a source of oxygen (88), food air or the like, and adapted to oxygenate the dregs. In the apparatus one or more nozzles (42) are movably mounted inside the tank to improve oxygenation.

Description

The invention relates to an apparatus for the treatment of a vegetable product in the form of crushed material.
Although the invention is useful for the treatment of any vegetable product in the form of crushed material or other liquid, the description that follows as an example will be referred to winemaking, where the invention has proved particularly effective.
Winemaking is accomplished with the help of special tanks, wherein the must is introduced to ferment. After some time, the marc present in the must floats onto the surface and forms a solid cap. Some techniques of winemaking plan at this point to transfer the must into another tank, to separate it from the cap.
In the second tank the must continues its fermentation and gives rise to a sticky sediment at the tank bottom, called dregs, arising from the deposit of mush and material previously in suspension.
The dregs contain important organoleptic components (e.g. they fix the color of wine), and to retrieve and disseminate them in the must the dregs are scraped from the tank bottom with moving bristles. Thus, the dregs re-mixes in the liquid.
The problem with this process is that the dregs tend to rot and stink, ruining the must. To oppose this undesired effect the side walls of the tank are usually provided with nozzles for injecting O2-bubbles or food air. The oxygenation preserves in time the dregs quality.
The disadvantages of this system are many. The release of 02 occurs only at the perimeter of the tank and hits the volume of must without completely reaching the dregs, the real target of the 02. The distance between the 02 and the dregs prevents mixing and interaction thereof, and reduces the effectiveness of 02.
It is an object of the present invention to provide a reliable fermentation apparatus for a vegetable product in the form of crushed material or other liquid, must preferentially, allowing better oxygenation of the dregs.
This object is achieved with a device as claimed in claim 1.
The advantage of having one or more nozzles mounted movably inside the tank is a greater spread of 02 or the like in the mixed fluid, so that both the fluid and the scraped, raised dregs oxygenate to a greater extent.
The preferred variants of the invention are defined in the dependent claims.
In particular having one or more nozzles with outlets which open at the central inner volume of the tank increases the volume of fluid involved in oxygenation.
By using driving means for setting in motion the one or more nozzles increases the volume of fluid which each nozzle is able to oxygenate.
If the driving means set in motion the one or more nozzles in sync with the scraping means, a synergy is accomplished between the scraping action and the oxygenating one, because the dregs are raised and oxygenated at the same time and completely.
In order to simplify the overall structure, one or more nozzles may be integrated in the scraping means, which preferably comprise one or more scraping members rotatably mounted on and in sliding contact with the bottom of the tank, and on one or more scraping members there are integrally arranged nozzles.
To better hit a lot of fluid with 02 it is good for one or more nozzles to be arranged on a spacing member extending from a scraping member towards the center and/or the top of the tank, in order to increase the mass of vegetable product involved in the oxygenation.
The problem of supplying with 02 the nozzles can be solved by an airtight joint comprising an inlet for feeding the one or more nozzles from the outside.
The joint may comprise
an external fixed member having an inlet opening for oxygen, food air or the like,
an internal member hermetically and rotatably contained within the external fixed member.
The internal member may have a conduit, formed integrally in it, which is adapted to fluidically communicate with the inlet opening for most of, or all, a round angle, and which opens into the tank.
One or more nozzles may be arranged also on a rotatable support member placed inside the tank at a height greater than the scraping means and unconstrained with respect thereto (rotatable independently from them).
It is advantageous to use driving means for rotating the rotatable support member with opposite rotation to the scraping means, in order to create in the fluid countercurrents fostering oxygenation.
Oxygenation may be controlled in time and space very finely.
To this aim, means for controlling the flow rate of each nozzle independently from each other, and/or means for controlling the spatial orientation of each nozzle independently from each other, may be used.
An apparatus according to the invention will now be described with reference to the drawings, wherein

Fig. 1 shows a winemaking apparatus according to the invention;
Fig. 2 shows a second winemaking apparatus according to the invention;
Fig. 3 shows a magnified detail of the winemaking apparatuses in Fig. 1 and 2;
Fig. 4 shows an enlarged cross-sectional view along the plane IV-IV of fig. 3;
Fig. 4 shows an enlarged detail of fig. 3 in vertical cross-section.

The invention can be adapted to many types of winemaking apparatuses.
For example in fig. 1 there is shown a winemaking apparatus 10 with an upper tank 12 and a lower tank 14. Must M is put to ferment in the tank 12, whereupon its most liquid part will be transferred by gravity (draining) in the tank 14 through a pipe system P1.
In fig. 2, instead, there is shown a winemaking apparatus 30 with an upper tank 32 and a lower tank 34. Must M is put to ferment in the tank 34, and from fermentation a floating marc cap 36 and a quantity of gas which accumulates in the reservoir 32 are generated.
By operating a pipe and the valve system P2 gases are released under the cap 36 for crushing it and spraying it with must.
In both cases the must M sediments and gives rise to a layer of dregs on the tank bottom 18, 28 it is in. The device of the invention, see fig. 3 reference 50, serves to scrape and oxygenate it. Since the device 50 may be used indifferently in the two winemaking apparatuses 10, 30, it is described only once.
The device 50 (Fig. 4) is mounted on the bottom 18, 28, of the tank 14, 34 and consists of a scraping means having two diametrical wings or blades 56 set in rotation by an external motor 60 about a vertical axis X.
On the wings 56 there are fixed a reinforcement vertical fan-shaped plate 52, parallel to the axis X, and a vertical arc-shaped blade 54 resting on the ends of the wings 56. A void space is thus formed between the blade 54 and the plate 52 (the shape of the blade 54 and the plate 52 may be different from those shown).
The wings 56 are connected to a rotatable support 58 (Fig. 5) which is part of an airtight joint 71 transferring rotary motion from the motor 60 to the wings 56 through a gearmotor 73 comprising gears allowing transmission by 90° and rpm-adaptation of the rotary motion generated by the motor 60 and brought to the wings 56.
The joint 71 is mounted with a fixed collar 80 on the gearmotor 73. The collar 80 presents an opening 82 in which a pipe 84 is sealingly inserted, whose function is to convey 02 or food air or any other gas from a source 88 to the inside of the tank 14, 34. On the pipe 84 there is mounted a valve 86 to adjust such a gas flow.
The collar 80 contains a cylindrical block 90 allowing the hermetic fastening to the bottom 18, 28. The block 90 has a conduit 92, coaxial to the opening 82, which communicates with an inner seal ring 91. The ring 91 is provided with radial seals in contact to which the stem of the support 58 can tightly rotate, driven by a pinion of the gearmotor 73. In the ring 91 an internal vertical conduit 94 is made which on one part opens inside the tank just below the wings 56 and on the other communicates with an annular seat 97 of the same ring 91. The seat 97 communicates with both the inlet of the conduit 94 and the outlet of the conduit 92, therefore an overall path for the gas between the pipe 84 and the outlet of the conduit 94 is established even when the support 58 rotates.
Through the internal construction of the joint 71 it is thus allowed the injection of 02 into the tank 14, 24 with simultaneous rotation of the nozzles 42. The gas transported by the pipe 84 goes through the joint 71 and comes out of the conduit 94, where it is able to feed a plurality of small tubes 40 ending with nozzles 42 located on top of the blade 54 (said nozzles and small tubes could also be attached to the scraping blades 56). The small tubes 40 are integral with the support 58 and can rotate together with it. The nozzles are oriented towards the center or the top of the tank, properly raised and/or spaced from the bottom 18, 28 towards the center of the tank 14, 24 thanks to the blade 54. Thus, greater is the mass of must M concerned by oxygenation.
The operation of the device 50 is as follows.
When the motor 60 sets in rotation the wings 56 and the blade 54, the valve 86 is set open. Therefore, a combined action of three factors is achieved: the wings 56 scrape the dregs from the bottom of the tank, the blade 54 (and also to a lesser extent the plate 52) mixes them in the must and the nozzles 42 oxygenate the dregs raised in, and, the must itself.
The shape of the plate 52 and the blade 54 may also be clearly different, depending on the characteristics of the crushed material (a comb- or mashed-blade or by integrating vanes).
A control unit (e.g. a PLC) may control singly the nozzles 42 , for example their flow rate (through valves on each of them) and/or their spatial orientation, for example through driving of tilt regulators (e.g. linear actuators). This allows establishing an oxygenation program, in which e.g. the flow rate and entry points of 02 vary over time and space.

Claims

Apparatus (10, 30) for the treatment of a vegetable product in the form of crushed material or liquid, preferentially must, comprising
- a tank (14, 34) to contain the vegetable product;

- scraping means (56) for scraping the dregs depositing on the bottom (18, 28) of the tank;

- one or more nozzles (42) connected to a source of oxygen (88), food air or the like, and adapted to oxygenate the dregs,
characterized in that said one or more nozzles (42) are movably mounted inside the tank.
Apparatus according to claim 1, wherein one or more nozzles (42) have the outlets opening at the inner central volume of the tank.
Apparatus according to claim 1 or 2, comprising driving means (60) for setting in motion the one or more nozzles.
Apparatus according to claim 3, wherein the driving means are adapted to set in motion the one or more nozzles in sync with the scraping means.
Apparatus according to any of the preceding claims, wherein one or more nozzles (42) are integrated in the scraping means (56).
Apparatus according to claim 5, wherein the scraping means comprise one or more scraping members (56) rotatably mounted on and in sliding contact with the bottom (18, 28) of the tank, on said one or more scraping members (56) being integrally arranged nozzles (42).
Apparatus according to claim 6, wherein one or more nozzles are arranged on a spacing member (54) extending from a scraping member (56) towards the center and/or the top of the tank, in order to increase the mass of vegetable product involved in the oxygenation.
Apparatus according to claim 6 or 7, comprising a gearmotor (73) which is fixed outside the bottom (18, 28) of the tank (14, 24) and has a shaft operatively connected to at least one scraping member (56) to transfer thereto the rotary motion generated by a motor (60), between said shaft and said at least one scraping member (56) being interposed an airtight joint comprising an inlet for feeding with oxygen, food air or the like the one or more nozzles from the outside.
Apparatus according to claim 8, wherein said airtight joint comprises
an external fixed member (80, 90) having an inlet opening (82) for oxygen, food air or the like,
an internal member (58) hermetically and rotatably contained within the external fixed member (80, 90), the internal member (58) having a conduit (94) formed integrally in it and adapted to fluidically communicate with said inlet opening (82) for most of, or all, a round angle, and which opens into the tank.
Apparatus according to any of the claims 1 to 4, wherein one or more nozzles (42) are arranged on a rotatable support member placed inside the tank at a height greater than the scraping means and rotatable independently therefrom.
Apparatus according to claim 10, comprising driving means for rotating the rotatable support member with opposite rotation to the scraping means.
Apparatus according to any of the preceding claims, comprising a second tank superimposed to the first from which the must can drain.
Apparatus according to any of the preceding claims, comprising means for controlling the flow rate of each nozzle independently from each other.
Apparatus according to any of the preceding claims, comprising means for controlling the spatial orientation of each nozzle independently from each other.